Please see the following test:
--------------------------------------------
public class A {
    public void #"class"() {}
    public void #"super"() {}
    public void #"this"() {}

    public static void main(String argv[]) {
        A testClass = new A();
        testClass.#"class"();
        testClass.#"super"();
        testClass.#"this"();
    }
}
-----------------------------------------------

The attempt to compile it using JDK 7 b76 fails with the output:
-----------------------------------------------
A.java:8: cannot find symbol
        testClass.#"class"();
        ^
  symbol: class testClass
  location: class A
A.java:9: call to super must be first statement in constructor
        testClass.#"super"();
                          ^
A.java:10: call to this must be first statement in constructor
        testClass.#"this"();
                         ^
3 errors
-----------------------------------------------

If these identifiers have special semantics it should be obviously mentioned in the specification.